Method for setting a filter coefficient for a communication system

ABSTRACT

A method for setting a filter coefficient for a communication system, which adjusts a frequency bandwidth by setting a filter coefficient of a wireless communication system over a communication network, is provided. In the method, a wireless communication system that includes a controller having a filter coefficient database and a web server, and a Digital Signal Processing device requests a filter coefficient and attribute information related to a set target frequency bandwidth from a management terminal. The wireless communication system receives the filter coefficient and the attribute information from the management terminal and stores the filter coefficient and the attribute information in the filter coefficient database. The wireless communication system sets a frequency bandwidth of the digital signal processing device as a set target frequency bandwidth based on the stored filter coefficient and the attribute information.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a divisional of U.S. patent application Ser. No.14/998,024, filed May 2, 2012, which claims priority to Korean PatentApplication No. 10-2011-0129508, filed on Dec. 6, 2011, and which is nowKorean Patent No. 10-1156667, registered on Jun. 8, 2012, the contentsof which are hereby incorporated by reference in their entirety.

BACKGROUND Technical Field

The present invention relates generally to a method for setting a filtercoefficient for a communication system, such as a wireless communicationsystem. More particularly, the invention relates to a method for settinga filter coefficient for a communication system which downloads and setsa digital filter that is used to set a frequency bandwidth, for example,upon performing communications using public frequencies over theInternet in a wireless communication system that includes a digitalsignal processing device to which filters can be variably applied.

Description of Related Art

Generally, in multi-channel systems such as Code Division MultipleAccess (CDMA) or Wideband CDMA (WCDMA) systems that have been widelyused in wireless communications, a filter for frequency assignment thatis serviced is fixed in advance and then used. In this case, such awireless communication system supports only filters of a fixedbandwidth. Accordingly, the wireless communication system allows onlysignals with a previously designated bandwidth to pass therethrough andblocks the remaining signals.

U.S. Pat. No. 6,697,603 discloses a digital repeater that includes ananalog to digital converter (“ADC”), a microcontroller unit (“MCU”), adigital signal processing (“DSP”) device, and a digital to analogconverter (“DAC”). To overcome usage constraints caused by differentuser environments between regions in the wireless communication systemand improve the efficiency of products, the ADC converts an analogsignal into a digital signal, the MCU and the DSP device are configuredto include a software configurable program to select serviced frequencyassignments for the digital signal and filter the digital signal, andthe DAC converts the digital signal into an analog signal and outputsthe analog signal.

However, a conventional filter coefficient setting method is problematicin that since it is a method of previously storing filters for servicedfrequency assignments, and selecting a required filter from among thefilters, it is generally not possible to in detail and freely setfiltering for a band desired by a user in frequency assignments that arenot supported by a particular product.

Therefore, the conventional filter coefficient setting method has theproblem of making it generally not possible to effectively useunsupported frequencies when such frequencies are desired.

Further, the conventional filter coefficient setting method isproblematic in that, in order to use public frequencies and specialfrequencies, the development of additional products for those frequencybands is required, and thus additional manpower and cost may also berequired.

SUMMARY

Accordingly, embodiments of the present invention have been made keepingin mind the above issues, and an aspect of the present invention is toprovide a filter coefficient setting method for a communication systemwhich adjusts a frequency bandwidth by setting a filter coefficient of awireless communication system over a communication network.

In accordance with an aspect of the present invention, there is providedmethod for setting a filter coefficient for a communication system,including utilizing a wireless communication system that includes acontroller having a filter coefficient database and a web server, and aDigital Signal Processing device to request a filter coefficient andattribute information related to a set target frequency bandwidth from amanagement terminal; receiving the filter coefficient and the attributeinformation from the management terminal at the wireless communicationsystem and storing the filter coefficient and the attribute informationin the filter coefficient database; and utilizing the wirelesscommunication system to set a frequency bandwidth of the digital signalprocessing device as a set target frequency bandwidth based on thestored filter coefficient and the attribute information.

In one embodiment, requesting the filter coefficient and the attributeinformation may include utilizing the wireless communication system totransmit a web page including status information to the managementterminal; and utilizing the management terminal to display the web pagereceived from the wireless communication system, and to set the filtercoefficient and the attribute information based on the displayed webpage.

In one embodiment, storing in the filter coefficient database mayinclude setting a name of the filter coefficient received from themanagement terminal as a name of the filter coefficient that is storedby the wireless communication system.

In one embodiment, storing in the filter coefficient database mayinclude setting a randomly generated character string as a name of thefilter coefficient that is stored by the wireless communication system.

In one embodiment, receiving and storing the filter coefficient and theattribute information may include storing attribute informationincluding a guard band of the filter coefficient.

In one embodiment, storing in the filter coefficient database mayinclude receiving information associated with whether a guard band ofthe filter coefficient is included from the management terminal.

In one embodiment, setting the set target frequency bandwidth mayinclude utilizing the wireless communication system to transmit one ormore filter coefficients that include the stored filter coefficient andattribute information, and displaying the filter coefficients at themanagement terminal; and utilizing the wireless communication system toset a frequency bandwidth corresponding to a single filter coefficientselected by the management terminal, from among the one or more filtercoefficients that are displayed as the set target frequency bandwidth.

In one embodiment, displaying the filter coefficients at the managementterminal may include displaying attribute information including names ofthe filter coefficients and frequency bandwidths associated with thefilter coefficients.

In one embodiment, setting the set target frequency bandwidth mayfurther include utilizing the wireless communication system to deleteone or more filter coefficients selected by the management terminal fromamong the one or more filter coefficients that are displayed, and todelete attribute information associated with the selected filtercoefficients.

In accordance with another aspect of the present invention, there isprovided a method for setting a filter coefficient for a communicationsystem, including utilizing a modem box that includes a filtercoefficient database and a web server to request a filter coefficientand attribute information related to a set target frequency bandwidthfrom a management terminal; receiving the filter coefficient and theattribute information from the management terminal at the modem box andstoring the filter coefficient and the attribute information in thefilter coefficient database; and utilizing the modem box to set afrequency bandwidth of a Digital Signal Processing device of a wirelesscommunication system as a set target frequency bandwidth based on thestored filter coefficient and the attribute information.

In one embodiment, requesting the filter coefficient and the attributeinformation may include utilizing the modem box to transmit a web pageincluding status information and to display the web page at themanagement terminal; and utilizing the management terminal to set thefilter coefficient and the attribute information based on the displayedweb page.

In one embodiment, storing in the filter coefficient database mayinclude setting a name of the filter coefficient received from themanagement terminal as a name of the filter coefficient to be stored bythe modem box.

In one embodiment, storing in the filter coefficient database mayinclude setting a randomly generated character string as a name of thefilter coefficient to be stored by the modem box.

In one embodiment, receiving and storing the filter coefficient and theattribute information may include storing attribute informationincluding a guard band of the filter coefficient.

In one embodiment, storing in the filter coefficient database mayinclude receiving information associated with whether a guard band ofthe filter coefficient is included from the management terminal.

In one embodiment, setting the set target frequency bandwidth mayinclude utilizing the modem box to transmit one or more filtercoefficients that include the stored filter coefficient and attributeinformation, and displaying the filter coefficients at the managementterminal; and utilizing the modem box to set a frequency bandwidthcorresponding to a single filter coefficient selected by the managementterminal, from among the one or more filter coefficients that aredisplayed, as the set target frequency bandwidth.

In one embodiment, displaying the filter coefficients at the managementterminal may include displaying attribute information including names ofthe filter coefficients and frequency bandwidths associated with thefilter coefficients.

In one embodiment, setting the set target frequency bandwidth mayfurther include utilizing the wireless communication system to deleteone or more filter coefficients selected by the management terminal fromamong the one or more filter coefficients that are displayed, and todelete attribute information associated with the selected filtercoefficients.

In accordance with embodiments of the present invention, the filtercoefficient setting method for the communication system adjusts thefrequency bandwidth by setting filter coefficients of a wirelesscommunication system over a communication network, thus obtaining anadvantage in that the band of the wireless communication system thatuses Radio Frequency (RF) bands, such as public frequency bands andservice bands of mobile communication companies, can be freely set usinga single product.

Further, the filter coefficient setting method for the communicationsystem according to embodiments of the present invention can freely setthe band of the wireless communication system, so that there is anadvantage in that, compared to the conventional technology, frequenciescan be more efficiently used and development costs, production costs,and maintenance costs of the wireless communication system can bereduced.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects and features of the present invention willbe more clearly understood from the following detailed description takenin conjunction with the accompanying drawings, in which:

FIGS. 1 and 2 are diagrams showing a communication system according to afirst embodiment of the present invention;

FIGS. 3 and 4 are flowcharts showing a filter coefficient setting methodfor a communication system according to the first embodiment of thepresent invention;

FIGS. 5 to 7 are diagrams showing a communication system according to asecond embodiment of the present invention; and

FIGS. 8 and 9 are flowcharts showing a filter coefficient setting methodfor a communication system according to the second embodiment of thepresent invention.

DETAILED DESCRIPTION

Exemplary embodiments of the present invention will be described indetail below, with reference to the accompanying drawings, to such anextent that those skilled in the art can easily implement the technicalspirit of embodiments according to the present invention. Referenceshould be made to the drawings, in which the same reference numerals areused throughout the different drawings to designate the same or similarcomponents. In the following description, redundant descriptions anddetailed descriptions of known elements or functions that mayunnecessarily make the gist of the present invention obscure may beomitted.

A configuration of a communication system for describing a filtercoefficient setting method for the communication system will be firstdescribed in detail below. FIGS. 1 and 2 are diagrams showing acommunication system according to a first embodiment of the presentinvention.

As shown in FIG. 1, the communication system is configured such that awireless communication system 100 and one or more management terminals200 are connected over the Internet 300.

The wireless communication system 100 includes a controller 120 forcontrolling internal operations of the system and a Digital SignalProcessing (DSP) device 140 for performing digital signal processing. Inthis case, the controller 120 includes a web server 124 and a filtercoefficient database 122.

The web server 124 transmits status information data of the wirelesscommunication system 100 stored in the filter coefficient database 122to the management terminals 200 in the form of a web page. That is, theweb server 124 allows the manager of the wireless communication system100 to check the status of the wireless communication system 100 throughweb browsers of each management terminal 200 and to set details.

The filter coefficient database 122 stores data related to the wirelesscommunication system 100. In this case, the filter coefficient database122 stores data that includes status information of the wirelesscommunication system 100 and filter coefficients, attribute information,etc. that are received from the management terminal 200.

Each management terminal 200 includes a web browser capable ofdisplaying a web page on which the status information of the wirelesscommunication system 100 is provided. In this regard, the managementterminal 200 is implemented as a device enabling data communication overthe Internet 300, for example, a personal computer, a notebook computer,or a Personal Digital Assistant (PDA) terminal.

Hereinafter, a filter coefficient setting method for a communicationsystem according to a first embodiment of the present invention will bedescribed in detail with reference to the attached drawings. FIGS. 3 and4 are flowcharts showing a filter coefficient setting method for acommunication system according to a first embodiment of the presentinvention.

First, the wireless communication system 100 requests a filtercoefficient and attribute information related to a set target frequencybandwidth from a relevant management terminal 200 at step S100. The stepof requesting the filter coefficient and the attribute information willbe described in detail below, with reference to FIG. 4.

When a manager requests the setting of or a change in the frequencybandwidth of the wireless communication system 100 via the managementterminal 200, the wireless communication system 100 transmits a web pageincluding its own status information to the management terminal 200. Themanagement terminal 200 outputs the web page received from the wirelesscommunication system 100, and displays the status information of thewireless communication system 100 on a screen at step S120.

The manager sets a filter coefficient and attribute information usingthe management terminal 200 at step S140. In this case, the manager setsthe filter coefficient and the attribute information with reference toor based on the displayed status information from the wirelesscommunication system 100. In this case, the management terminal 200receives attribute information, including the description or thefeatures of the filter coefficient and the name of the filtercoefficient, from the manager. The management terminal 200 may omit thereception of the description or the features of the filter coefficientand the name of the filter coefficient. The management terminal 200receives information about whether the guard band of the filtercoefficient is included in the attribute information, together with theattribute information, from the manager. Here, the manager may check thefilter coefficient and the attribute information, set via the managementterminal 200, using the web browser.

The wireless communication system 100 stores the filter coefficient andthe attribute information received from the management terminal 200 atstep S200. That is, the wireless communication system 100 receives thefilter coefficient and the attribute information, which were set in stepS140, from the management terminal 200. The wireless communicationsystem 100 stores the filter coefficient and the attribute informationin the filter coefficient database 122.

In this case, the wireless communication system 100 may set the name ofthe filter coefficient, input from the management terminal 200, as thename of the filter coefficient to be stored, and may then store thefilter coefficient. When the name of the filter coefficient is not inputfrom the management terminal 200, the wireless communication system 100may set a randomly generated character string as the name of the filtercoefficient, and then stores the filter coefficient.

Together with the filter coefficient, the wireless communication system100 stores attribute information including the guard band of the filtercoefficient. In this regard, the wireless communication system 100receives from the management terminal 200 information about whether theguard band of the filter coefficient is included in the attributeinformation.

The wireless communication system 100 sets the frequency bandwidth atstep S300. That is, the wireless communication system 100 sets thefrequency bandwidth of the DSP device 140 as the set target frequencybandwidth, on the basis of the filter coefficient and the attributeinformation that have been stored. The step of setting the frequencybandwidth will be described in detail below.

The wireless communication system 100 transmits one or more filtercoefficients, including the stored filter coefficient and attributeinformation, to the management terminal 200. The management terminal 200displays the received filter coefficients on the screen. In this case,the management terminal 200 displays attribute information, includingthe names of the filter coefficients and the frequency bandwidthsassociated with the filter coefficients.

The manager selects filter coefficients corresponding to a desiredfrequency band from among the one or more filter coefficients displayedon the management terminal 200. That is, the manager inputs a frequencycorresponding to at least one of the start, middle, and end frequenciesof the desired frequency band using the management terminal 200, andsets the bandwidth of the frequency band. In this case, the setting ofthe bandwidth is executed in such a way that the bandwidth is selectedon the basis of pieces of information that have been input together whenthe filter coefficients are stored, that is, the descriptions orfeatures of the filter coefficients, the names of the filtercoefficients, and information about whether the guard bands of thefilter coefficients are included in the attribute information.

The management terminal 200 transmits the filter coefficients selectedby the manager and the attribute information thereof to the wirelesscommunication system 100. The wireless communication system 100 sets thefrequency bandwidth corresponding to the filter coefficients receivedfrom the management terminal 200 as the set target frequency bandwidth.In this regard, the wireless communication system 100 may delete one ormore filter coefficients selected by the management terminal 200 fromamong the one or more filter coefficients that are displayed, and mayalso delete pieces of attribute information, such as the descriptions orfeatures of the selected filter coefficients, the names of the filtercoefficients, and information about whether the guard bands of thefilter coefficients are included in the attribute information.

FIGS. 5 to 7 are diagrams showing a communication system according to asecond embodiment of the present invention.

As shown in FIG. 5, the communication system is configured such that amodem box 400, one or more wireless communication systems 500, and oneor more management terminals 600 are connected over the Internet 300. Inthis case, as shown in FIG. 6, the modem box 400 is a multi-wirelesscommunication system monitoring device including a filter coefficientdatabase 420 and a web server 440. As shown in FIG. 7, each wirelesscommunication system 500 includes a web server 520 and a digital signalprocessing (DSP) device 540 for performing digital signal processing.That is, the second embodiment of the present invention is configuredsuch that part of the function of the wireless communication system 500may be performed by the modem box 400. In this case, the individualcomponents of the modem box 400 and the wireless communication system500 may be the same as those of the wireless communication system 100 inthe above first embodiment, and thus a detailed description thereof willbe omitted.

Hereinafter, a filter coefficient setting method for a communicationsystem according to the second embodiment of the present invention willbe described in detail with reference to the attached drawings. FIGS. 8and 9 are flowcharts showing a filter coefficient setting method for acommunication system according to the second embodiment of the presentinvention.

First, the modem box 400 requests a filter coefficient and attributeinformation related to a set target frequency bandwidth from a relevantmanagement terminal 600 at step S400. That is, when a manager requeststhe setting of or a change in the frequency bandwidth of the modem box400 via the management terminal 600, the modem box 400 transmits a webpage including its own status information to the management terminal600. The management terminal 600 outputs the web page received from themodem box 400, and displays the status information of the modem box 400on the screen at step S420.

The manager sets the filter coefficient and attribute information usingthe management terminal 600 at step S440. In this case, the manager setsthe filter coefficient and the attribute information with reference tothe displayed status information of the modem box 400. In this regard,the management terminal 600 receives attribute information, includingthe description or features of the filter coefficient and the name ofthe filter coefficient, from the manager. The management terminal 600may omit the reception of the description or the features of the filtercoefficient and the name of the filter coefficient. The managementterminal 600 receives information about whether the guard band of thefilter coefficient is included in the attribute information, togetherwith the attribute information, from the manager. Here, the manager maycheck the filter coefficient and the attribute information, set via themanagement terminal 600, using the web browser.

The modem box 400 stores the filter coefficient and the attributeinformation received from the management terminal 600 at step S500. Thatis, the modem box 400 receives the filter coefficient and the attributeinformation, which were set in step S440, from the management terminal600. The modem box 400 stores the filter coefficient and the attributeinformation in the filter coefficient database 420.

In this case, the modem box 400 may set the name of the filtercoefficient, input from the management terminal 600, as the name of thefilter coefficient to be stored, and may then store the filtercoefficient. When the name of the filter coefficient is not input fromthe management terminal 600, the modem box 400 may set a randomlygenerated character string as the name of the filter coefficient, andthen store the filter coefficient.

Together with the filter coefficient, the modem box 400 stores theattribute information, including the guard band of the filtercoefficient. Here, the modem box 400 receives from the managementterminal 600 information about whether the guard band of the filtercoefficient is included in the attribute information.

The modem box 400 sets the frequency bandwidth at step S600. That is,the modem box 400 sets the frequency bandwidth of the DSP device 540 ofthe wireless communication system 500 at the set target frequencybandwidth, on the basis of the filter coefficient and the attributeinformation that have been stored. The step of setting the frequencybandwidth will be described in detail below.

The modem box 400 transmits one or more filter coefficients, includingthe stored filter coefficient and attribute information, to themanagement terminal 600. The management terminal 600 displays thereceived filter coefficients on the screen. In this case, the managementterminal 600 displays attribute information, including the names of thefilter coefficients and the frequency bandwidths associated with thefilter coefficients.

The manager selects filter coefficients corresponding to a desiredfrequency band from among the one or more filter coefficients displayedon the management terminal 600. That is, the manager inputs a frequencycorresponding to at least one of the start, middle and end frequenciesof the desired frequency band using the management terminal 600, andsets the bandwidth of the frequency band. In this case, the setting ofthe bandwidth is executed in such a way that the bandwidth is selectedon the basis of pieces of information that have been input together whenthe filter coefficients are stored, that is, the descriptions orfeatures of the filter coefficients, the names of the filtercoefficients, and information about whether the guard bands of thefilter coefficients are included in the attribute information.

The management terminal 600 transmits the filter coefficients selectedby the manager and the attribute information thereof to the modem box400. The modem box 400 sets the frequency bandwidth corresponding to thefilter coefficients received from the management terminal 600 as the settarget frequency bandwidth. In this regard, the modem box 400 may deleteone or more filter coefficients selected by the management terminal 600from among the one or more filter coefficients that are displayed, andmay also delete pieces of attribute information, such as thedescriptions or features of the selected filter coefficients, the namesof the filter coefficients, and information about whether the guardbands of the filter coefficients are included in the attributeinformation. The modem box 400 sets the frequencies by loading thefilter coefficients onto the DSP device 540 of the wirelesscommunication system 500.

As described above, the filter coefficient setting method for thecommunication system adjusts the frequency bandwidth by setting thefilter coefficients of a wireless communication system over acommunication network. Therefore, a band of a wireless communicationsystem that uses Radio Frequency (RF) bands, such as a public frequencyband and the service bands of mobile communication companies, can befreely set using a single product.

Further, since the filter coefficient setting method for thecommunication system can freely set a band of a wireless communicationsystem, there is an advantage in that compared to the conventionaltechnology, frequencies can be efficiently used, and development costs,production costs, and maintenance costs of a wireless communicationsystem can also be reduced.

Although exemplary embodiments of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions, and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims, and their equivalents.

The invention claimed is:
 1. A method for setting a filter coefficientfor a communication system, comprising: utilizing a modem box thatincludes a filter coefficient database and a web server to request afilter coefficient and attribute information related to a set targetfrequency bandwidth from a management terminal; receiving the filtercoefficient and the attribute information from the management terminalat the modem box and storing the filter coefficient and the attributeinformation in the filter coefficient database; and utilizing the modembox to set a frequency bandwidth of a Digital Signal Processing deviceof a wireless communication system as a set target frequency bandwidthbased on the stored filter coefficient and the attribute information. 2.The method of claim 1, wherein requesting the filter coefficient and theattribute information comprises: utilizing the modem box to transmit aweb page including status information and to display the web page at themanagement terminal; and utilizing the management terminal to set thefilter coefficient and the attribute information based on the displayedweb page.
 3. The method of claim 1, wherein storing in the filtercoefficient database comprises setting a name of the filter coefficientreceived from the management terminal as a name of the filtercoefficient to be stored by the modem box.
 4. The method of claim 1,wherein storing in the filter coefficient database comprises setting arandomly generated character string as a name of the filter coefficientto be stored by the modem box.
 5. The method of claim 1, whereinreceiving and storing the filter coefficient and the attributeinformation comprises storing attribute information including a guardband of the filter coefficient.
 6. The method of claim 1, whereinstoring in the filter coefficient database comprises receivinginformation associated with whether a guard band of the filtercoefficient is included from the management terminal.
 7. The method ofclaim 1, wherein setting the set target frequency bandwidth comprises:utilizing the modem box to transmit one or more filter coefficients thatinclude the stored filter coefficient and attribute information, anddisplaying the filter coefficients at the management terminal; andutilizing the modem box to set a frequency bandwidth corresponding to asingle filter coefficient selected by the management terminal, fromamong the one or more filter coefficients that are displayed, as the settarget frequency bandwidth.
 8. The method of claim 7, wherein displayingthe filter coefficients at the management terminal comprises displayingattribute information including names of the filter coefficients andfrequency bandwidths associated with the filter coefficients.
 9. Themethod of claim 7, wherein setting the set target frequency bandwidthfurther comprises utilizing the wireless communication system to deleteone or more filter coefficients selected by the management terminal fromamong the one or more filter coefficients that are displayed, and todelete attribute information associated with the selected filtercoefficients.